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[PULL 25/48] modules: add documentation for module sourcesets


From: Paolo Bonzini
Subject: [PULL 25/48] modules: add documentation for module sourcesets
Date: Thu, 8 Jul 2021 17:17:25 +0200

From: Gerd Hoffmann <kraxel@redhat.com>

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Jose R. Ziviani <jziviani@suse.de>
Message-Id: <20210624103836.2382472-22-kraxel@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 docs/devel/build-system.rst | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/docs/devel/build-system.rst b/docs/devel/build-system.rst
index 7ef36f42d0..fd1650442e 100644
--- a/docs/devel/build-system.rst
+++ b/docs/devel/build-system.rst
@@ -272,6 +272,23 @@ Target-dependent emulator sourcesets:
     target_arch += {'arm': arm_ss}
     target_softmmu_arch += {'arm': arm_softmmu_ss}
 
+Module sourcesets:
+  There are two dictionaries for modules: `modules` is used for
+  target-independent modules and `target_modules` is used for
+  target-dependent modules.  When modules are disabled the `module`
+  source sets are added to `softmmu_ss` and the `target_modules`
+  source sets are added to `specific_ss`.
+
+  Both dictionaries are nested.  One dictionary is created per
+  subdirectory, and these per-subdirectory dictionaries are added to
+  the toplevel dictionaries.  For example::
+
+    hw_display_modules = {}
+    qxl_ss = ss.source_set()
+    ...
+    hw_display_modules += { 'qxl': qxl_ss }
+    modules += { 'hw-display': hw_display_modules }
+
 Utility sourcesets:
   All binaries link with a static library `libqemuutil.a`.  This library
   is built from several sourcesets; most of them however host generated
-- 
2.31.1





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